Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

TRACE ancillary:a highly-segmented silicon-pad detector

for light charged particles emitted indirect nuclear reactions

Daniele MengoniUniversità e Sezione INFN di Padova

ITALIA

DREB07, RIKEN, JapanMay 30 ÷ June 2, 2007

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Outline

1 Introduction

2 TRACE simulation and designEstimations, simulation and performances evaluationSignals induced in silicon

3 Experimental testsIn beam test: silicon ancillary coupled to the AGATA clusterDetector & electronics (NIM, ASIC) tests

4 Conclusion

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Introduction

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

IntroductionInstrumentation: γ-spectrometers

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

IntroductionInstrumentation: ancillaries used in conjunction with γ-spectrometers

Selectivity improvement and background reduction

PRISMA

DANTE

MICROBALL

TIARAMUST2

EUCLIDES

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

IntroductionSuitable reactions

Direct nuclear reactionsin inverse kinematics to measure the angle of the recoiling lightparticle.

... Fusion-evaporation reactionsto measure energy and angle of the recoiling light particle withancillary detectors coupled with gamma arrays.

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

IntroductionSuitable reactions

Direct nuclear reactionsin inverse kinematics to measure the angle of the recoiling lightparticle.

... Fusion-evaporation reactionsto measure energy and angle of the recoiling light particle withancillary detectors coupled with gamma arrays.

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Design criteria

Guidelines

Material Transparency, energy resolution,properties, costs

Particle discriminationtechnique

Segmentation

Efficiency

Pad (or strips)

4π detector

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Design criteria

Guidelines

MaterialParticle discriminationtechnique E-∆E, thickness

Segmentation

Efficiency

Pad (or strips)

4π detector

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Design criteria

Guidelines

Material

Particle discriminationtechniqueSegmentation Angular resolution

Efficiency

Pad (or strips)

4π detector

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Design criteria

Guidelines

Material

Particle discriminationtechnique

SegmentationEfficiency Solid angle coverage, lowenergy threshold

Pad (or strips)

4π detector

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Design criteria

Guidelines

Material

Particle discriminationtechnique

Segmentation

EfficiencyPad (or strips) Sizable number, heatdissipation, energy resolution

4π detector

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Design criteria

Guidelines

Material

Particle discriminationtechnique

Segmentation

Efficiency

Pad (or strips)4π detector Reaction kinematics

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Simulation: frameworkEvent generator, radiation interaction, filter (PSA, tracking), data collection (matricesand spectra)

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Simulation: frameworkEvent generator, radiation interaction, filter (PSA, tracking), data collection (matricesand spectra)

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Simulation: frameworkEvent generator, radiation interaction, filter (PSA, tracking), data collection (matricesand spectra)

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Simulation: frameworkEvent generator, radiation interaction, filter (PSA, tracking), data collection (matricesand spectra)

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Simulation: frameworkEvent generator, radiation interaction, filter (PSA, tracking), data collection (matricesand spectra)

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Simulation: frameworkEvent generator, radiation interaction, filter (PSA, tracking), data collection (matricesand spectra)

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Simulation: TRACETRacking Array for light Charged particle Ejectiles

Starting point: improvement of the EUCLIDES Si ball;

Next steps: increase segmentation and solid anglecoverage without losing in simplicity (barrel, end-caps).

Hodoscope Euclides-like TRACE4,6,8module

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Transparency

Full-energy eff.:probability to detect the total energy of any emittedphoton individually

Peak-to-total ratio: the ratio of full energy efficiency to the totalinteraction efficiency.

Absolute photopeak eff. (%)

15

20

25

30

35

40

45

50

0 500 1000 1500 2000 2500 3000

Absolute photopeak eff. (%)

Energy (keV)

A180A180+Al chamber+EUCLIDESA180+Al chamber+TRACE4A180+Al chamber+TRACE6A180+Al chamber+TRACE8

Peak-to-total ratio (%)

0

20

40

60

80

100

0 500 1000 1500 2000 2500 3000

Peak-to-total ratio (%)

Energy (keV)

A180A180+Al chamber+EUCLIDES

A180+Al chamber+TRACE4+ASICsA180+Al chamber+TRACE6A180+Al chamber+TRACE8

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Doppler correctionTRACE8

Doppler broadening

uncertainty in the photon emission angle

uncertainty in the recoil energy

intrinsic detector resolution

2

2.5

3

3.5

4

4.5

5

5.5

6

6.5

0 1 2 3 4 5 6 7 8

FWHM (keV)

Segmentation (mm2)

transfer v/c=6.4%transfer v/c=7.8%

0

0.2

0.4

0.6

0.8

1

1.2

0 20 40 60 80 100 120 140 160 180

∆Eγ/E

γ (%)

Angle (deg)

∆θ = 0.5°∆β = 1%

v/c=15%v/c=10%v/c= 5%

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Collecting electrodesRear side current signals as a function of the injected particles.The particles are injected in the middle of the central pad.

α family3_MeV 5_MeV 10_MeV 30_MeV

Time (s)

1e−10 1e−09 1e−08 1e−07 1e−06 1e−05

Cu

rre

nt

(A)

2e−05

4e−05

6e−05

8e−05

1e−04

proton family3_MeV 5_MeV 10_MeV 30_MeV

Time (s)

1e−10 1e−09 1e−08 1e−07 1e−06 1e−05

Cu

rre

nt

(A)

1e−04

2e−04

3e−04

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Neighbour electrodesRear side, bipolar transient signals as a function of the injected particles.The particles are injected in the middle of the central pad.

α family3_MeV 5_MeV 10_MeV 30_MeV

Time (s)

1E−10 1E−9 1E−8 1E−7 1E−6 1E−5

Cu

rre

nt

(A)

−3e−06

−2e−06

−1e−06

0

proton family30_MeV 10_MeV 5_MeV 3_MeV

Time (s)

1E−10 1E−9 1E−8 1E−7 1E−6 1E−5

Cu

rre

nt

(A)

−2e−06

0

2e−06

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Ancillary impactSingle hit on Si, Ge cluster

Silicon center, PSA on Ge detector

Full information on the DSSSD, PSA on Ge detector

AGATA cluster + ancillary 49Ti Energy resolution

1365 1370 1375 1380 1385 1390 1395

1000

2000

3000

4000

5000

6000

E_titleCLUSTCORRCAL_pSIpGE

6.1 keV7.7 keV

Cou

nts

keV

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Preliminary tests: ITC-IRST detectors300 µm,1 mm, 1.5 mm thickness, 1x1, 2x2, 4x4 mm2, low resistivity, AC coupling.

Junction side: DC, AC pad; biasand reference voltage; guardrings; “punch-through” resistance.

pad layout zoom

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Preliminary tests: ITC-IRST detectorsEnergy resolution with modular NIM and ASIC electronics

0

50

100

150

200

250

300

350

400

450

4800 5000 5200 5400 5600 5800 6000 6200

Counts

Energy (keV)

50 keV

0

2000

4000

6000

8000

10000

12000

4800 5000 5200 5400 5600 5800 6000 6200

Counts

Energy (keV)

60 keV

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

ConclusionTelescope Prototype

ASIC: quasi-parallel energy-time cycle;

Telescope prototype closely resembles the traditional Sitelescope;

TRACE prototype key features: Si-pad technology,integrated electronics, high segmentation, PSA ...

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Summary

Simple estimations

Geometry simulation

PSA simulation

Ancillary impact

Si and electronics test

=⇒ telescope specifications and possible prototype.

Future perspectives:PSA testIn beam test

Introduction TRACE simulation and design Experimental tests Conclusion Summary Acknowledgements

Acknowledgements

INFN (Italy)

LNL: A. Gadea, G. Prete, G. de Angelis, J.J. Valiente-Dobon,R. Orlandi, F. della Vedova, E. Sahin, R.P. Singh, R. Ponchia,P. Cocconi, D. Rosso.

Sezione di Padova: F. Recchia, E. Farnea, D.Bazzacco,S.Lunardi, C. Ur, R. Isocrate.

Sezione di Perugia: E. Fiandrini, G. Ambrosi, M. Ionica,G. Alberti.

IN2P3 (F)

C.M. Petrache, P. Edelbruck, L. Lavergne, L. Leterrier, and theMUST2 team.

Surrey University (UK)

P.H. Regan and the TIARA team.